function getById(id) { return document.getElementById(id);}
function getCookie(name) {
    var dc = document.cookie;
    var prefix = name + "=";
    var begin = dc.indexOf("; " + prefix);
    if (begin == -1) {
        begin = dc.indexOf(prefix);
        if (begin != 0) return null;
    } else {
        begin += 2;
    }
    var end = document.cookie.indexOf(";", begin);
    if (end == -1) {
        end = dc.length;
    }
    return unescape(dc.substring(begin + prefix.length, end));
}

function setCookie(name, value, expires, path, domain, secure) {
    document.cookie= name + "=" + escape(value) +
    ((expires) ? "; expires=" + expires.toGMTString() : "") +
    "; path=/" +
    ((domain) ? "; domain=" + domain : "") +
    ((secure) ? "; secure" : "");
}
function setheader(screen) {
    getById('img1').style.display = 'none';
    getById('img2').style.display = 'none';
    getById('img'+screen).style.display = 'block';
    getById('open').style.display = 'none';
    getById('close').style.display = 'none';
    if (screen == 2){
        getById('more1').style.display = 'block';
        getById('more2').style.display = 'block';
        getById('more0').style.display = 'none';
        getById('close').style.display = 'block';
        if (getById('headerbx').className.substring((getById('headerbx').className.length - 6), (getById('headerbx').className.length)) == ' small')
            getById('headerbx').className = getById('headerbx').className.substring(0, (getById('headerbx').className.length - 6) );

    }else{
        getById('more1').style.display = 'none';
        getById('more2').style.display = 'none';
        getById('more0').style.display = 'block';
        getById('open').style.display = 'block';
        if (getById('headerbx').className.substring((getById('headerbx').className.length - 6), (getById('headerbx').className.length)) != ' small')
            getById('headerbx').className = getById('headerbx').className + ' small';
    }
    setCookie('header', screen);
}